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Finding the Fourth Proportional to 320.99, 481.02 and 138.13

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Solution

The fourth proportional to 320.99, 481.02 and 138.13 is: 206.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.99 : 481.02 = 138.13 : x
  2. Step 2: Convert to fraction form
    320.99/481.02 = 138.13/x
  3. Step 3: Cross multiply
    320.99x = 481.02 × 138.13
  4. Step 4: Simplify right side
    320.99x = 66,440.89
  5. Step 5: Solve for x
    x = 66,440.89/320.99
  6. Step 6: Final answer
    x = 206.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.